A high-temperature and high-pressure multi-stage waste heat recovery device for coal chemical industry

Abstract

The utility model provides a kind of for coal chemical high temperature high pressure multistage waste heat recovery device, it is related to waste heat recovery device field, and it includes: heat exchange box, the left side of heat exchange box is equipped with water inlet, and water inlet inside end is connected with shunt pipe, while being equipped with water outlet pipe in heat exchange box right side, and the right end of shunt pipe is connected with water outlet pipe by collection pipe, the outside of shunt pipe is connected with locating slow flow plate, and locating slow flow plate includes plate body, and the inside of plate body is equipped with locating hole and slow flow hole, the inside of heat exchange box is equipped with primary flue, secondary flue and tertiary flue, and secondary flue is connected between primary flue and tertiary flue, while primary flue is located secondary flue and tertiary flue upside, the upside of primary flue is connected with smoke inlet, and the upside of tertiary flue is connected with smoke outlet. The utility model has the effect that flue gas and water pipe are fully contacted heat exchange, further reduce the loss of heat, improve the efficiency of waste heat recovery.

Description

Technical Field

[0001] This utility model relates to the technical field of waste heat recovery devices, specifically to a multi-stage waste heat recovery device for high temperature and high pressure in coal chemical industry. Background Technology

[0002] Coal chemical engineering uses coal as a raw material, chemically processing it into gaseous, liquid, and solid products or semi-finished products, which are then further processed into chemical and energy products. It mainly includes coal gasification, liquefaction, and dry distillation, as well as coal tar processing and calcium carbide acetylene chemical engineering. With the continuous depletion of global oil resources, coal chemical engineering has broad application prospects. A search revealed existing technology (publication number: CN216205528U), which describes "a waste heat recovery device for a coal chemical plant, comprising: a recovery cylinder; an inlet pipe and an exhaust pipe fixedly connected to the upper surface of the top plate of the recovery cylinder; an outlet pipe, an inlet pipe, and a support column fixedly connected to the lower surface of the bottom plate of the recovery cylinder; a flow plate fixedly connected to the inner wall of the recovery cylinder; the flow plate and the inner wall of the recovery cylinder cooperate to form an arc-shaped water channel; the top and bottom ends of the arc-shaped water channel are connected to the inlet pipe and the outlet pipe, respectively; the arc-shaped water channel is used to guide cooling water flow; a flue gas pipe is inserted inside the arc-shaped water channel; the top and bottom ends of the flue gas pipe are connected to the exhaust pipe and the inlet pipe, respectively; the flue gas pipe is used to guide flue gas flow. This utility model can achieve stepped heating of cooling water and increase the heat exchange time between cooling water and flue gas in the recovery cylinder, thereby improving energy utilization efficiency."

[0003] Although the waste heat recovery device for coal chemical plants involved in the aforementioned patent documents has achieved energy recovery efficiency, it still has some shortcomings: when the existing waste heat recovery device for coal chemical plants is in use, there is a gap between the water flow plate and the flue gas pipe, which means that some water may not be able to fully contact the flue gas pipe to achieve the heat exchange effect. Secondly, in the high temperature and high pressure flue gas emission, the flue gas has a fast flow rate and a large amount of heat inside the device, which means that it cannot be fully heat exchanged before being discharged, and a large amount of heat is wasted. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, a high-temperature and high-pressure multi-stage waste heat recovery device for coal chemical industry is provided to solve the problems mentioned in the background.

[0005] To achieve the above object, a high-temperature and high-pressure multi-stage waste heat recovery device for coal chemical industry is provided, including: a heat exchange box, with a water inlet provided on the left side of the heat exchange box, and a shunt pipe connected to the inner end of the water inlet. At the same time, a water outlet pipe is provided on the right side of the heat exchange box, and the right end of the shunt pipe is connected to the water outlet pipe through a collecting pipe. A positioning flow retarder plate is connected to the outside of the shunt pipe, and the positioning flow retarder plate includes a plate body, and a positioning hole and a flow retarder hole are opened inside the plate body. Inside the heat exchange box, there are a primary flue, a secondary flue and a tertiary flue, and the secondary flue is connected between the primary flue and the tertiary flue. At the same time, the primary flue is located above the secondary flue and the tertiary flue. An inlet flue is connected to the upper side of the primary flue, and an outlet flue is connected to the upper side of the tertiary flue.

[0006] Further, the water inlet includes a water inlet pipe, and a conical pipe is connected to the inner end of the water inlet pipe, and diversion holes are opened on the inner side wall of the conical pipe.

[0007] Further, the conical pipe is disposed inside the heat exchange box, and the diversion holes are connected to the left end of the shunt pipe.

[0008] Further, heat conducting sheets are welded to the outer wall of the shunt pipe, and the heat conducting sheets are in a semi-circular plate structure.

[0009] Further, the primary flue, the secondary flue and the tertiary flue are in a "ji" shape structure inside the heat exchange box, and the shunt pipe is arranged along the path of the flue.

[0010] Further, the plate body is fixed to the inner wall of the flue, and the shunt pipe vertically passes through the positioning hole. [[ID=ID=16]]

[0011] Further, the inner diameter of the flow retarder hole is smaller than that of the shunt pipe, and a wire filter screen is welded inside the flow retarder hole.

[0012] The beneficial effects of the present utility model are as follows:

[0013] 1. During use, through the provided inlet flue, primary flue, secondary flue, tertiary flue and outlet flue, the high-temperature and high-pressure flue gas passes through the inside of the heat exchange box, and then through the flow retarder holes opened inside multiple positioning flow retarder plates and the horizontally arranged multi-stage flues, the flue gas is blocked and retarded, the flow rate of the flue gas is reduced, the contact time between the flue gas and the shunt pipe in the flue is increased, the heat exchange efficiency is improved, and the loss of the heat energy of the flue gas is reduced;

[0014] 2. By using the water inlet pipe, conical pipe and diversion port included in the water inlet, the cold water is guided to the shunt pipe through the water inlet. The shunt pipe is laid along the path of the multi-stage flue, so as to be completely covered and wrapped by the flue gas, realizing full contact between the flue gas and the shunt pipe. At the same time, the contact area with the shunt pipe is increased through the heat conducting sheets, and the heat exchange efficiency is improved. Brief Description of the Drawings

[0015] Figure 1 This is a schematic diagram of the internal structure of the heat exchanger box according to an embodiment of the present utility model.

[0016] Figure 2 This is a three-dimensional structural diagram of the water inlet according to an embodiment of the present utility model.

[0017] Figure 3 This is a three-dimensional structural diagram of the positioning flow buffer plate according to an embodiment of the present utility model.

[0018] Figure 4 This is a three-dimensional structural diagram of the diversion tube according to an embodiment of the present utility model.

[0019] In the diagram: 1. Heat exchanger box; 11. Primary flue; 12. Secondary flue; 13. Tertiary flue; 2. Water inlet; 21. Water inlet pipe; 22. Conical pipe; 23. Diverter hole; 3. Positioning baffle plate; 31. Plate body; 32. Positioning hole; 33. Diverter hole; 4. Diverter pipe; 41. Heat-conducting fin; 5. Flue gas inlet; 6. Flue gas outlet; 7. Collecting pipe; 8. Water outlet pipe. Detailed Implementation

[0020] Reference Figures 1 to 4 As shown, this utility model provides a high-temperature and high-pressure multi-stage waste heat recovery device for coal chemical industry, including: a heat exchange box 1, an inlet 2 on the left side of the heat exchange box 1, and a diversion pipe 4 connected to the inner end of the inlet 2; an outlet pipe 8 on the right side of the heat exchange box 1, and the right end of the diversion pipe 4 connected to the outlet pipe 8 through a collecting pipe 7; a positioning and flow-slowing plate 3 connected to the outer side of the diversion pipe 4; the positioning and flow-slowing plate 3 includes a plate body 31, and the plate body 31 has a positioning hole 32 and a flow-slowing hole 33 inside; the heat exchange box 1 has a primary flue 11, a secondary flue 12 and a tertiary flue 13 inside; the secondary flue 12 is connected between the primary flue 11 and the tertiary flue 13; the primary flue 11 is located above the secondary flue 12 and the tertiary flue 13; an inlet 5 is connected to the upper side of the primary flue 11; and an outlet 6 is connected to the upper side of the tertiary flue 13.

[0021] In this embodiment, the heat exchange box 1 and its internal components constitute the main structure of the high-temperature and high-pressure multi-stage waste heat recovery device for coal chemical industry involved in this application.

[0022] The heat exchange box 1 includes a metal outer shell and an inner shell, and the space between the outer shell and the inner shell is filled with insulation material to reduce the loss of heat from the flue gas.

[0023] Specifically, the flue gas flow direction inside heat exchange box 1 is opposite to the water flow direction.

[0024] Specifically, sealing rings are provided at the connection points of the diversion pipe 4, the collection pipe 7, and the inlet 2 to achieve sealing of the flue gas.

[0025] Specifically, there are multiple groups of positioning flow retarder plates 3. On the one hand, the positioning holes 32 are used to position and fix the shunt pipe 4, and on the other hand, multiple flow retarder holes 33 are used to slow down the flow of flue gas.

[0026] Specifically, vertical flue segments are connected between the primary flue 11 and the tertiary flue 13 and the secondary flue 12, and flow valves are provided at the smoke outlet 6 and the smoke inlet 5, so as to control the flow rate of the incoming and outgoing flue gas, ensuring the content of flue gas in the internal flue, that is, ensuring the effect of completely wrapping the shunt pipe 4.

[0027] As Figures 1 to 4 shown in [Figure], the water inlet 2 includes a water inlet pipe 21, and the inner end of the water inlet pipe 21 is connected with a conical pipe 22. And diversion holes 23 are opened on the inner side wall of the conical pipe 22. The conical pipe 22 is arranged inside the heat exchange box 1, and the diversion holes 23 are connected to the left end of the shunt pipe 4. Heat conducting sheets 41 are welded on the outer wall of the shunt pipe 4, and the heat conducting sheets 41 are set as semi-circular plate structures. The primary flue 11, the secondary flue 12 and the tertiary flue 13 are in a "ji" shape structure inside the heat exchange box 1, and the shunt pipe 4 is arranged along the path of the flue. The plate body 31 is fixed on the inner wall of the flue, and the shunt pipe 4 vertically passes through the positioning holes 32. The inner diameter of the flow retarder holes 33 is smaller than that of the shunt pipe 4, and wire mesh filters are welded in the flow retarder holes 33.

[0028] Specifically, the inner end of the conical pipe 22 is connected with a round pipe with both ends closed, and a partition is provided at the connection between the round pipe and the conical pipe 22. Through holes are opened inside the partition, and the diversion holes 23 are opened at the inner closed end of the round pipe.

[0029] As a preferred embodiment, by setting the heat conducting sheets 41, on the one hand, the contact area with the flue gas is increased, so that the heat conducting sheets 41 heated by the flue gas can maintain the temperature for a long time, and then the pipe wall of the shunt pipe 4 is heated.

[0030] During use, through the provided smoke inlet, primary flue, secondary flue, tertiary flue and smoke outlet, the high-temperature and high-pressure flue gas passes through the inside of the heat exchange box, and then through the flow retarder holes opened inside multiple positioning flow retarder plates and the horizontally arranged multi-stage flues, the flue gas is blocked and slowed down, the flow rate of the flue gas is reduced, so that the contact time between the flue gas and the shunt pipe in the flue is increased, the heat exchange efficiency is improved, and the loss of the heat energy of the flue gas is reduced; by using the water inlet pipe, conical pipe and diversion port included in the water inlet, the cold water is guided to the shunt pipe through the water inlet. The shunt pipe is laid along the path of the multi-stage flue, realizing complete coverage and wrapping by the flue gas, achieving full contact between the flue gas and the shunt pipe, and at the same time increasing the contact area with the shunt pipe through the heat conducting sheets, improving the heat exchange efficiency.

[0031] This utility model of a high-temperature and high-pressure multi-stage waste heat recovery device for coal chemical industry can effectively solve the problems mentioned in the background technology. Based on the existing technology of high-temperature and high-pressure multi-stage waste heat recovery devices for coal chemical industry, it can achieve the effect of full contact heat exchange between flue gas and water pipes, further reducing heat loss and improving the efficiency of waste heat recovery.

Claims

1. A multi-stage waste heat recovery device for high-temperature and high-pressure coal chemical industry, comprising: Heat exchange box (1), characterized in that: an inlet (2) is provided on the left side of the heat exchange box (1), and a shunt pipe (4) is connected to the inner end of the inlet (2). At the same time, an outlet pipe (8) is provided on the right side of the heat exchange box (1), and the right end of the shunt pipe (4) is connected to the outlet pipe (8) through a collecting pipe (7). A positioning flow retarder plate (3) is connected to the outside of the shunt pipe (4), and the positioning flow retarder plate (3) includes a plate body (31), and a positioning hole (32) and a flow retarder hole (33) are formed inside the plate body (31). An upper flue (11), a middle flue (12) and a lower flue (13) are provided inside the heat exchange box (1), and the middle flue (12) is connected between the upper flue (11) and the lower flue (13). At the same time, the upper flue (11) is located above the middle flue (12) and the lower flue (13). An inlet flue (5) is connected to the upper side of the upper flue (11), and an outlet flue (6) is connected to the upper side of the lower flue (13).

2. The multi-stage waste heat recovery device for high-temperature and high-pressure coal chemical industry according to claim 1, characterized in that, The inlet (2) includes an inlet pipe (21), and a conical pipe (22) is connected to the inner end of the inlet pipe (21), and diversion holes (23) are formed on the inner side wall of the conical pipe (22).

3. A multi-stage waste heat recovery device for high-temperature and high-pressure coal chemical industry according to claim 2, characterized in that, The conical pipe (22) is arranged inside the heat exchange box (1), and the diversion holes (23) are connected to the left end of the shunt pipe (4).

4. The multi-stage waste heat recovery device for high-temperature and high-pressure coal chemical industry according to claim 1, characterized in that, Heat conducting sheets (41) are welded to the outer wall of the shunt pipe (4), and the heat conducting sheets (41) are in a semi-circular plate structure.

5. A multi-stage waste heat recovery device for high-temperature and high-pressure coal chemical industry according to claim 1, characterized in that, The upper flue (11), the middle flue (12) and the lower flue (13) are in a "W" - shaped structure inside the heat exchange box (1), and the shunt pipe (4) is arranged along the path of the flue.

6. A multi-stage waste heat recovery device for high-temperature and high-pressure coal chemical industry according to claim 1, characterized in that, The plate body (31) is fixed to the inner wall of the flue, and the shunt pipe (4) vertically passes through the positioning hole (32).

7. A multi-stage waste heat recovery device for high-temperature and high-pressure coal chemical industry according to claim 1, characterized in that, The inner diameter of the flow retarder hole (33) is smaller than that of the shunt pipe (4), and a wire filter screen is welded inside the flow retarder hole (33).

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